因项目需求，需要对用户信息进行加密(以登录为例),前台js中对用户名密码进行加密传输。

然后后台进行解密操作 先看一下效果图

未对其加密传输

对其加密传输

从以上可以看出如果不对其进行加密的话，用户的一些敏感信息将会被捕捉到

    <script type="text/javascript">            $(function() {                $("#btn").click(function() {                    var username = encode64($("#username").val());  //对数据加密                    var password = encode64($("#password").val());                    $("#username").val(username);                    $("#password").val(password);                    document.fm.submit();  //fm为form表单name                })            })                        // base64加密开始            var keyStr = "ABCDEFGHIJKLMNOP" + "QRSTUVWXYZabcdef" + "ghijklmnopqrstuv"                    + "wxyz0123456789+/" + "=";                        function encode64(input) {                        var output = "";                var chr1, chr2, chr3 = "";                var enc1, enc2, enc3, enc4 = "";                var i = 0;                do {                    chr1 = input.charCodeAt(i++);                    chr2 = input.charCodeAt(i++);                    chr3 = input.charCodeAt(i++);                    enc1 = chr1 >> 2;                    enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);                    enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);                    enc4 = chr3 & 63;                    if (isNaN(chr2)) {                        enc3 = enc4 = 64;                    } else if (isNaN(chr3)) {                        enc4 = 64;                    }                    output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2)                            + keyStr.charAt(enc3) + keyStr.charAt(enc4);                    chr1 = chr2 = chr3 = "";                    enc1 = enc2 = enc3 = enc4 = "";                } while (i < input.length);                        return output;            }            // base64加密结束        </script>  

    private static char[] base64EncodeChars = new char[] { 'A', 'B', 'C', 'D',                'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q',                'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',                'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q',                'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3',                '4', '5', '6', '7', '8', '9', '+', '/', };                private static byte[] base64DecodeChars = new byte[] { -1, -1, -1, -1, -1,                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,                -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,                -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59,                60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,                10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1,                -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,                38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1,                -1, -1 };                /**        * 解密        * @param str        * @return        */        public static byte[] decode(String str) {            byte[] data = str.getBytes();            int len = data.length;            ByteArrayOutputStream buf = new ByteArrayOutputStream(len);            int i = 0;            int b1, b2, b3, b4;                    while (i < len) {                do {                    b1 = base64DecodeChars[data[i++]];                } while (i < len && b1 == -1);                if (b1 == -1) {                    break;                }                        do {                    b2 = base64DecodeChars[data[i++]];                } while (i < len && b2 == -1);                if (b2 == -1) {                    break;                }                buf.write((int) ((b1 << 2) | ((b2 & 0x30) >>> 4)));                        do {                    b3 = data[i++];                    if (b3 == 61) {                        return buf.toByteArray();                    }                    b3 = base64DecodeChars[b3];                } while (i < len && b3 == -1);                if (b3 == -1) {                    break;                }                buf.write((int) (((b2 & 0x0f) << 4) | ((b3 & 0x3c) >>> 2)));                        do {                    b4 = data[i++];                    if (b4 == 61) {                        return buf.toByteArray();                    }                    b4 = base64DecodeChars[b4];                } while (i < len && b4 == -1);                if (b4 == -1) {                    break;                }                buf.write((int) (((b3 & 0x03) << 6) | b4));            }            return buf.toByteArray();        }  

作者：itmyhome